Reinforced concrete ribbed ceiling

ABSTRACT

A support structure for a reinforced concrete ribbed ceiling consists of a number of sections which each form a combined shuttering and support element and which are connected one to another. Each of the sections comprises a skin of thin steel sheet bent in zig-zag fashion such that its cross section includes at least one upwardly open trapezoidal portion, a continuous reinforcing mat spot welded onto the skin, a stirrup basket spot welded into each said trapezoidal section, and support reinforcement in each said basket.

United States Patent Bastgen 1 1 Nov. 26, 1974 REINFORCED CONCRETERIBBED 3,178,856 4/1965 Grebner 52/337 CEILING 3,245,186 4/1966 Jentoft76] Inv tor A10 5 B t Ef 1 tr 8 5561 3,389,521 6/1968 Gregori 52/251 Xen i gifi g ggj FOREIGN PATENTS OR APPLICATIONS 152,872 3 1938 Austria52 336 [22] Filed: June 4, 1973 712,932 9/1966 ltaly 52/336 892,2421/1944 France 52/334 [21] Appl' 366407 1,008,501 2 1952 France 52 334Related US. Application Data 1,281,091 11/1961 France 52/337 [63]Continuation of No. 141,582, May 10 1971, 332,331 7/1930 Great Br1ta1n52/336 abandoned,

Primary Examiner-Alfred C. Perham [52] US. Cl 52/327, 52/250, 52/334,Attorney, Agent, or Firm-Robert Beach; R 52/336, 52/337 Van Wmkle [51].Int. Cl E04b 1/16 [58] Field of Search..... 52/334, 336, 337, 250-252ABSTRACT A support structure for a reinforced concrete ribbed 1References Cited ceiling consists of a number of sections which eachUNITED STATES PATENTS form a combined shuttering and support element and775,927 11 1904 Kal'ln 52 336 which are Cohhficted one to ahother- EaChof the 1,073,542 9/l913 52/452 X tions comprises a skin of thin steelsheet bent in zig 3 ,1 3 7 1927 52 52 zag fashion such that its crosssection includes at least 1,821,355 9/1931 52/336 one upwardly opentrapezoidal portion, a continuous 1,863,258 6/1932 52/337 X reinforcingmat spot welded onto the skin, a stirrup 1,995,496 3/1935 52/336 Xbasket spot welded into each said trapezoidal section, 2,405,116 8/194652/329 X and support reinforcement in each said basket. 2,926,518 3/196052/452 3,113,402 12/1963 Butler 52/329 X 1 Claim, 7 Drawing FiguresPATEHYL UV 2 5 4 SHEU is UF Q mrenzor: mos s VB/ISTGEN ATTORNEYREINFORCED CONCRETE RIBBED CEILING This is a continuation of applicationSer. No. 141,582, filed May 10, 1971 and now abandoned.

This invention relates to a reinforcedconcrete ribbed ceiling.

Reinforced-concrete ribbed ceilings are known in which ribs are arrangedto extend parallel one to another at spaced intervals, the entireceiling being reinforced by steel inserts. .Such reinforced-concreteribbed ceilings were hitherto either constructed on a specialscaffolding having shuttering or were assembled from reinforced-concretefinished parts. In each case, scaffolding or shuttering has to beerected and, after the concreting, has to be removed again. Whenerecting such supporting structures on site, the shuttering iscomparatively complicated and expensive. Moreover, it is difficult toachieve consistently accurate dimensions of the finished ribs.

The object of the invention is to provide a reinforcedconcrete ceilingwhich can be produced without the need for a special scaffolding andshuttering,.whereby the costs of construction can be lowered and thepreviously occurring defects can be avoided.

With this object in view, a reinforced-concrete ribbed ceiling isproposed which is characterised in that arranged on the underside is askin, made of thin steel sheet which is designed as shuttering andsupport element and which consists of several sections which areconnected to one another and each of which overlaps at least one supportrib of the neighbouring ceiling sections and is bent in zig-zag fashionin such a way that it has in cross section at least one upwardly opentrapezoidal section. The skin is strengthened by a continuousreinforcing mat spot welded to its upper surface; and each upwardly opentrapezoidal section of the skin receines a stirrup basket spot welded tothe skin into which basket support'reinforcement is inserted.

Advantageously the upwardly open trapezoidal sections of the skin arearranged at a spacing one from another a distance equal to the opentrapezoidal side. More especially when mounted above supports, the opentrapezoidal sections of the skin are arranged directly adjacent.

The size of the upwardly open trapezoidal sections arranged at a spacingis equal to the size of the directly adjacent upwardly open trapezoidalsections. In the case of the directly adjacent upwardly open trapezoidalsections, a head sheet is arranged at the end of every second trapezoid.At the edge of supports the downwardly open trapezoidal sections ortriangular sections are likewise provided with head sheets.

The invention will now be described further, by way of example, withreference to the accompanying drawings, in which:

FIG. I is a cross section through a reinforcedconcrete ribbed ceilingsection utilizing a support structure according to the invention;

FIG. 2 shows a longitudinal section on the line IIII of FIG. I;

FIG. 3 is a cross section through a reinforced concrete ribbed ceilingsection utilizing a modified support structure according to theinvention;

FIG. 4 shows a longitudinal section on the line IVIV of FIG. 3;

FIG. 5 shows a perspective representation of two structural elements,butting against each other, corresponding to the embodiment inaccordance with FIG.

I and the embodiment in accordance with FIG. 3 in the case of acontinuous supporting structure having a transverse rib;

FIG. 6 shows a perspective representation of structural elements of theembodiment in accordance with FIG. 1 for the formation of single-panelsupporting structures having reinforcements; and

FIG. 7 shows a perspective representation of structural elements of theembodiment in accordance with FIG. I in conjunction with structuralelements of the embodiment in accordance with FIG. 3 with a transverserib and formation of a reinforcedcon crete beam support for a continuoussupporting structure.

A reinforced-concrete ribbed ceiling comprises several concrete ribs 1,arranged parallel one to another at spaced intervals, and a ceilingplate 2 lying thereover and connecting the concrete ribs 1 one toanother. In accordance with the invention, arranged on the underside ofthe ribbed ceiling is a support structure made .of thin steel sheet,formed by a number of interconnected sections each of which is designedas a combined shuttering and support element.

In the embodiment A of FIG. I and 2, a skin 3 of each section is made ofthin steel sheet bent in zig-zag fashion in such a way that it has awidthwise cross section which includes at least one upwardly opentrapezoidal section. This part of the skin covers a concrete rib I frombelow, while the parts adjoining onto both sides give rise to the lowercovering for the ceiling plate 2 laying between the concrete ribs.

Spot welded onto the skin 3 is a continuous reinforcing mat 4. Insertedinto each of the open trapezoidal portions of the skin is a stirrupbasket 5 having 21 Sup port reinforcement 5a, which basket is spotwelded onto the base and sides of the trapezoidal portions of the skin 3in order to strengthen the supporting structure. The concrete ribs 1 ofthe skin 3 surrounding them supports a suspended ceiling 6.

The individual sections of the support structure are connected one toanother end-to-end by connecting rings 7.

In the embodiment B shown in. FIGS. 3 and 4, the concrete ribs I andconsequently the upwardly open trapezoidal sections of the skin arearranged closely adjacent so that downwardly open triangles are formedbetween the trapezoidal sections, instead of the downwardly opentrapezoidal sections which occur in the case of the embodiment A inaccordance with FIG. 1 and 2. The embodiment shown in FIG. 3 and 4 ismost advantageously used as a continuous structure across supports,while in the panels the embodiment A in accordance with FIG. I and 2 isused.

In its construction, the embodiment B resembles that of FIG. 1 and 2,but with the difference that, according to the embodiment B of FIG. 3and 4, twice the number of ribs 1 and consequently also upwardly opentrapezoidal sections are present. The size of the open trapezoidalsections is, however, in the case of FIGSI and 3 equal, so that it ispossible, for example, to place a structural element of the embodiment Ain accordance with FIG. 1 and a structural element B in accordance withFIG. 3 directly in end-to-end juxtaposition and also in end-to-endoverlapping relationship as is represented in FIG. 5. Advantageously, atthe end of each of the alternate upwardly open trapezoidal sections ofthe structural element B which is spanned by the horizontal connectingstructural elements of the embodiment A,

a head plate is provided to close the end of the rib and thereby confinethe poured concrete therein. Likewise, the downwardly open trapezoidalsections and triangular sections of the structural elements of theembodiments A and B can be sealed on the supports by means of headplates 11.

As shown in FIG. 5, to distribute the loads onto several ribs, moreespecially in the case of large span widths, it is necessary to arrangeribs 8 in accordance with FIGS. 5 or 7 with corresponding transversereinforcement 9. The transverse ribs 8 are formed in that the downwardlyopen trapzoidal sections are closed by a base 10 having a lateral,upright head plates 11. In order to be able to insert the concrete andthe lateral reinforcement 9 into the channel and in order to obtain aconnection between the concrete of the rib and ceiling plate,rectangular apertures 12 corresponding to the width of the transverserib 8 are hollowed out in the upper surface and in the lateralcrosspieces of the trapezoidal plate of the embodiment A.

Represented in FIG. 6 is a structural element in accordance with theembodiment A having a reinforcing network 4, stirrup baskets 5 andsupport reinforcements 5a fora statically intended supporting structure(single panel plate). The downwardly open trapezoidal sections areclosed on the support by head plates, so that the concrete for theribbed ceiling can be introduced.

Represented in FIG. 7 is the arrangement of the structural elements ofthe embodiments A and B of a continuous ribbed ceiling for thesuperposition onto a reinforced concrete transom 13 which acts as asupport. The transom 13 is thus formed by an upwardly open sheet-metalchannel, in which the sheet metal is strengthened by a spot weldedstirrup basket made of reinforced mats. The transverse rib 8 is producedby a continuous channel above an auxiliary support 14. The structuralelements of the embodiment A are separated above the auxiliary supports,while the reinforcing mat 4, the stirrup basket 5 and the supportreinforcement 5a pass through from the transom 13 to the support 15. Sothat the structural elements of the embodiment A and A/B can even belaid in position before the assembly of the auxiliary supports 14 in onepiece from the support 15 to the transom 13, the missing upper and lowerchord is replaced by spot-welded strengthened skin cover plates 16 andconsequently the missing supporting cross section is produced inconjunction with the reinforcing mat 4 and the stirrup basket 5.

However, it is also possible to cut out only the upper surface and thesloping side surfaces out of the trapezoidal sections, so that then onlythe missing upper chord is to be replaced by strengthened skin coverplates. The downwardly open trapezoidal sections on the transverse riband the wall support, as well as the triangles on the transom, aresealed by head plates. On the left edge of the representation theconcrete cross section is indicated as being strengthened withreinforcement.

With the aid of the support structure in accordance with the invention,a reinforced-concrete ribbed ceiling can be produced in a simple mannerquickly and true to size. In this connection the skin serves initially,during the installation with spot-welded reinforcing mat and stirrupbasket, as a scaffolding and shuttering and, in the case of the finishedceiling, as an additional strengthening of the reinforcement. It isnaturally also possible to manufacture the skin from another suitablematerial, for example plastics, instead of steel sheet.

I claim:

1. A reinforced concrete ribbed ceiling comprising supporting structuremeans for providing scaffolding, shuttering and integral load-carryingcapacity including a lower thin steel skin bent to form a plurality ofupwardly opening trapezoidal channels, said channels being spaced aparta distance equal to the width of a channel opening, downwardly openingtrapezoidal channels being defined therebetween, a wire reinforcingnetwork spot welded to the upper side of said skin and spanning itsentire longitudinal and transverse extent, and stirrup means in saidtrapezoidal channels spot welded to the channel skin and having portionsextending above said channels and spot welded to said reinforcingnetwork, a bottom strip spanning transversely across the skin bottom, aplurality of upright head plates closing the downwardly opening channelsat opposite sides of said bottom strip, the downwardly opening channelsincluding apertures in their closed channel bottoms and inclined channelsides between head plates, concrete carried by said skin embedding saidreinforcing network and said stirrup means, the channel skin, stirrupmeans, and concrete of the channels forming integral longitudinal ribs,and concrete filling the transverse rectangular channels between thebottom plate and the head plates integral with concrete in the upwardlyopening trapezoidal channels forming a

1. A reinforced concrete ribbed ceiling comprising supporting structure means for providIng scaffolding, shuttering and integral load-carrying capacity including a lower thin steel skin bent to form a plurality of upwardly opening trapezoidal channels, said channels being spaced apart a distance equal to the width of a channel opening, downwardly opening trapezoidal channels being defined therebetween, a wire reinforcing network spot welded to the upper side of said skin and spanning its entire longitudinal and transverse extent, and stirrup means in said trapezoidal channels spot welded to the channel skin and having portions extending above said channels and spot welded to said reinforcing network, a bottom strip spanning transversely across the skin bottom, a plurality of upright head plates closing the downwardly opening channels at opposite sides of said bottom strip, the downwardly opening channels including apertures in their closed channel bottoms and inclined channel sides between head plates, concrete carried by said skin embedding said reinforcing network and said stirrup means, the channel skin, stirrup means, and concrete of the channels forming integral longitudinal ribs, and concrete filling the transverse rectangular channels between the bottom plate and the head plates integral with concrete in the upwardly opening trapezoidal channels forming a transverse rib. 